Investigation of the Local Structure of the LiNi[sub 0.5]Mn[sub 0.5]O[sub 2] Cathode Material during Electrochemical Cycling by X-Ray Absorption and NMR Spectroscopy

We have investigated the nanostructuring effects on the local structure of V2O5 cathode material by means of temperature dependent V K-edge X-ray absorption fine structure measurements.

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Local structure of LiNi0.5Mn0.5O2 cathode material probed by in situ x-ray absorption spectroscopy

Journal of Applied Physics ◽

10.1063/1.2179198 ◽

2006 ◽

Vol 99 (6) ◽

pp. 063701 ◽

Cited By ~ 23

Author(s):

Aniruddha Deb ◽

Uwe Bergmann ◽

Stephen P. Cramer ◽

Elton J. Cairns

Keyword(s):

Cathode Material ◽

Absorption Spectroscopy ◽

Local Structure ◽

X Ray ◽

Lini0.5Mn0.5O2 Cathode Material ◽

X Ray Absorption

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Application of In Situ X-ray Absorption Spectroscopy to Study Dilute Chromium Ions in a Molten Chloride Salt

10.26434/chemrxiv.9959807 ◽

2019 ◽

Author(s):

Jisue Moon ◽

Carter Abney ◽

Dmitriy Dolzhnikov ◽

James M. Kurley ◽

Kevin A. Beyer ◽

...

Keyword(s):

Absorption Spectroscopy ◽

Local Structure ◽

Chloride Salt ◽

X Ray ◽

Molten Chloride ◽

Stable Species ◽

Higher Temperature ◽

Cr Concentration ◽

X Ray Absorption

The local structure of dilute CrCl3 in a molten MgCl2:KCl salt was investigated by in situ x-ray absorption spectroscopy (XAS) at temperatures from room temperature to 800oC. This constitutes the first experiment where dilute Cr speciation is explored in a molten chloride salt, ostensibly due to the compounding challenges arising from a low Cr concentration in a matrix of heavy absorbers at extreme temperatures. CrCl3 was confirmed to be the stable species between 200 and 500oC, while mobility of metal ions at higher temperature (>700oC) prevented confirmation of the local structure.

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Local structure and cation distribution analysis of Mn1-xZnxFe2O4 powders by X-ray Absorption Near Edge Structure Spectroscopy

Radiation Physics and Chemistry ◽

10.1016/j.radphyschem.2021.109628 ◽

2021 ◽

pp. 109628

Author(s):

Jaru Jutimoosik ◽

Pinit Kidkhunthod ◽

Theerachai Bongkarn ◽

Rattikorn Yimnirun

Keyword(s):

Cation Distribution ◽

Local Structure ◽

Distribution Analysis ◽

Edge Structure ◽

X Ray ◽

X Ray Absorption

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Local Structure and Dynamics of Functional Materials Studied by X-ray Absorption Fine Structure

Symmetry ◽

10.3390/sym13081315 ◽

2021 ◽

Vol 13 (8) ◽

pp. 1315

Author(s):

Takafumi Miyanaga

Keyword(s):

Fine Structure ◽

Local Structure ◽

Chemical Reactivity ◽

Functional Materials ◽

X Ray ◽

Structure And Dynamics ◽

Absorption Fine ◽

Structure Phase Transition ◽

Local Electronic Structure ◽

X Ray Absorption

X-ray absorption fine structure (XAFS) is a powerful technique used to analyze a local electronic structure, local atomic structure, and structural dynamics. In this review, I present examples of XAFS that apply to the local structure and dynamics of functional materials: (1) structure phase transition in perovskite PbTiO3 and magnetic FeRhPd alloys; (2) nano-scaled fluctuations related to their magnetic properties in Ni–Mn alloys and Fe/Cr thin films; and (3) the Debye–Waller factors related to the chemical reactivity for catalysis in polyanions and ligand exchange reaction. This study shows that the local structure and dynamics are related to the characteristic function of the materials.

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The Study of Magnetic Properties for Non-Magnetic Ions Doped BiFeO3

Materials ◽

10.3390/ma14154061 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4061

Author(s):

Yongtao Li ◽

Liqing Liu ◽

Dehao Wang ◽

Hongguang Zhang ◽

Xuemin He ◽

...

Keyword(s):

Magnetic Properties ◽

Local Structure ◽

Metal Ion ◽

Single Phase ◽

Sol Gel ◽

X Ray ◽

Co Doping ◽

Magnetic Ions ◽

X Ray Absorption ◽

Fe Ions

BiFeO3 is considered as a single phase multiferroic. However, its magnetism is very weak. We study the magnetic properties of BiFeO3 by Cu and (Cu, Zn). Polycrystalline samples Bi(Fe0.95Cu0.05)O3 and BiFe0.95(Zn0.025Cu0.025)O3 are prepared by the sol-gel method. The magnetic properties of BiFe0.95(Zn0.025Cu0.025)O3 are greater than that of BiFeO3 and Bi(Fe0.95Cu0.05)O3. The analyses of X-ray absorption fine structure data show that the doped Cu atoms well occupy the sites of the Fe atoms. X-ray absorption near edge spectra data confirm that the valence state of Fe ions does not change. Cu and Zn metal ion co-doping has no impact on the local structure of the Fe and Bi atoms. The modification of magnetism by doping Zn can be understood by the view of the occupation site of non-magnetically active Zn2+.

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